So what is currently the best terminal program for Disk Basic that will support the full ANSI control codes and work in 32, 40, and 80 column screens as well as use the bitbanger port, Deluxe RS232 Pak, and Modem Pak addresses?

Unlikely I will find this next option but also a Disk Basic terminal program that might also support the OS-9 screen control codes as well.

Back in the day I used to use ultiterm or ultimaterm it might have been called. I think it only worked with 80 column mode and I think it had VT100 emulation and there were a few different serial ports to select. There is also one on Sock Master's site that is probably even better, but I haven't used it before.